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I have a unique problem. My solenoid valve opens up if I knock on the body of humidifier when furnace is on. So I thought there might be some loose wire. I followed your instructions and opened up the humidifier. I did not see any loose wire. I did one test by plugging power supply 120 v and I short circuited the wires to humidistat. I could read 27.5 volts across solenoid yellow wires. Do you think I need to replace control board to get 24 volts.Thanks